The best case scenario I can see is that cryptocurrencies push the US banking system to adopt something like the British "Faster Payment Services". If anyone be

The best case scenario I can see is that cryptocurrencies push the US banking system to adopt something like the British "Faster Payment Services". If anyone begins to gain adoption they will be outcompeted by incumbent banks. It has never been the case that banking has been limited by technology for quicker and cheaper transactions in the US.